Aw Crud. Problem with Wireless router...

mine did the opposite - it forgot who it was and went back to the default ID - requiring changing the logins of all computers (eventually I may get around to plugging in my computer and trying to reprogram it, but it currently works despite my computer whining that it doesn't like routers with default names)

Hoo boy, now you're making me remember my TCP/IP stuff. Beware! Possible blathering follows...

The only problem I can see is if one of your devices skimped on it's protocols--specifically on how it manages its ARP table.

ARP is the thing that connects the IP address to the physical MAC address. A MAC address is supposed to be unique to every device ever manufactured (although some cheaper manufacturers cheat) and never changes. IP addresses are usually assigned dynamically, and change depending on the network configuration.

Ideally, if your router configuration is identical to the one you're replacing, your network may "bobble" a little as it reconfigures itself, but there should be no problem.

Unfortunately, some products don't deal with their ARP table very well, and you get cases where one box insists on trying to talk to a MAC address that isn't there anymore. In this case, it's a bug--but one so common I've seen it very, very often.

Best thing to do is to power down the offending device for at least a minute, then restart it. That should wipe out its ARP cache and force it to renegotiate with the new router.

One thing I've seen with multiple routers in close proximity is that their radio transmitter/receivers literally were broadcasting on top of each other (even when set to autonegotiate their channels). Changing one to a different frequency fixed the issue.

Personally, I've swapped my router out with a new one twice. Each time, I kept the same configuration amd only had one problem with one older device on the net. Curiously, Windows 7 decided to number it's network connection differently based on SSID. So, suddenly I was no longer connected to "My Network Name" but "My Network Name 2". Didn't affect operation, but it did tell me the network recognized the MAC was different, at least.

What can I say? My first access point was massively overpriced and you had to use Cisco IOS CLI to configure it. Since then, I've been very suspicious of all "plug-n-play" nonsense, and have the scars to prove it.

Plus, I literally know (as in we go out to lunch now and then) some of the folks who design the firmware for many of the access point/routers for the lower end home/small business market. Some even do competitive analysis, i.e.: they buy every router in their market they can find and beat them to death to find holes in the competitor's products. Every now and then, over some Dim Sum, we'll hear the story of how company X screwed up again, and needs to update/recall/kill and bury in a cornfield at midnight one of their designs.

I'm glad it worked out for you. In the near past, it didn't always.

Now I feel like one of the Four Yorkshiremen: "We had it tough..."